![]() It is suitable for filling the voids in the concrete. The polyurethane expands about 2-40 times from its original volume.It is not used to repair the structural cracks.When there is a concern about material leaking, the polyurethane injection is suitable.However, it is a more effective and efficient type in the presence of water.įurther, there are advantages and disadvantages of polyurethane injection when compared to epoxy grout injection. Polyurethane injection is not a common type of concrete crack repair method when compared to the other types. However, this could be decided in consultation with the engineer and as per the product specification. The grout injection pressure could be maintained in the range of 0.1 -0.5 MPa.Injection of the epoxy grout shall be started from the lower end when a vertical crack is sealed.Injection/filling shall be done until it appears that the grout coming out from the next nipple. Injection of the epoxy grout shall be started from one end when horizontal cracks are sealed.It shall be allowed to cure as specified in the product specification. A width of about 50mm could be sealed and the thickness of the sealant applied on the surface could be at least 2mm.For example, in a slab, nipples could be placed on both sides to make sure the whole crack is filled with grout. When the crack has penetrated across the section, nipples could be placed on both sides. Seal the crack from the surface by using suitable epoxy grout or adhesive material.The spacing could be selected based on the length of the crack. They could be placed at a maximum spacing of about 300mm. Generally, the crack repair with epoxy grout will be done by injecting with some pressure.This shall be done for a width of about 50mm. Firstly clean the area where the concrete crack repair needs to be done.The crack could be penetrated up to a certain depth or it could be penetrated across the section.The following procedure can be followed when the concrete crack repair is done with epoxy construction grout. It is more suitable type of structural crack repairs. Further, it will be applied with pressure allowing it to fill the whole crack. Develop high compressive strength than the concreteĮpoxy grout is flowable and can be penetrated into very small cracks.High bond to the concrete, high tensile capacity than normal concrete.Grater bond to the steel than the cement.It is a type of grout having the following features. Let’s discuss each type of crack sealing method in detail. Secondary methods – Indirect Methods – when a crack affect the structural capacity Sealing the crack by flexible sealant could be done to avoid the deterioration of concrete and corrosion of reinforcement. ![]() Further, some of these methods may require one of the above methods to seal the cracks. They are not directly related to the sealing of the cracks, but they can also be considered as a secondary method for the issues. In addition to the above, there are other methods to treat cracked concrete. Movement Joints, Expansion Joints and Contraction Joints.Flexible Sealing – Grooving and Sealing.Thermal cracks – due to the change in temperature of the structuresĭepending on the treatment made to the crack and the nature of the repair is used to categorize the different methods of concrete crack repair.Thermal cracks – due to the heat of hydration.The formation of cracks in the could be due to many reasons. Corrosion of reinforcements and rapid deterioration of the structure could experience with this. The formation of cracks up to the reinforcements is the main issue with respect to the durability of the structure. ![]() However, this value may be required to adjust depending on the exposure class.Īnother concern of the concrete cracks is the depth of the crack.
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